Dear Pradeep Mani
If you want to delete partner Functions only to single customer it is possible in xd02 all ready Other members given perfect solution..
But if you if you want to delete Partner functions to so many customers then only chance is LSMW
in this case MASS T.code not Possible
And XD99 Also not possible
Or Use CATT/SCAT To delete Partner functions to multiple customers
Thanks a lot
venu 